SELF-SUSTAINED OSCILLATION OF A SUBMERGED JET IN A THIN RECTANGULAR CAVITY

✍ Scribed by N.J. LAWSON; M.R. DAVIDSON

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 506 KB
• Volume: 15
• Category: Article
• ISSN: 0889-9746
• DOI: 10.1006/jfls.2000.0327

✦ Synopsis

Self-sustained oscillating jet #ow of water in a rectangular cavity, having thickness which is small relative to its width, is measured using LDA and PIV, and predicted using a transient two-dimensional computational #uid dynamic model which incorporates a resistance coe$cient for cross-#ow. The basic geometry represents a scale model of a mould typical of thin slab steel casting. The frequency of the oscillation was found to be independent of cavity thickness. It also increased as the cavity width decreased down to some critical value, after which the oscillation ceased. The frequency was observed to increase with nozzle diameter and was found to decrease with increasing length/width ratio of the cavity. The numerical model, with a "xed dimensionless cross-#ow resistance coe$cient, was shown to predict the Strouhal number of the oscillation and the dimensionless mean velocity pro"les in the jet extremely well.